"Tracing services often locate and reunite parents with children during recovery," said Unni Krishnan, disaster response policy coordinator at Plan International.
IRIN asked experts about current best practice on how to reunite families.
The first phase is to find separated children, register them at the national Red Cross society, and place them in temporary families while following up on leads to the location of parents, according to Corinna Chasky, child protection adviser at UK-based Save the Children.
Communities can be alerted to look out for missing children through radio or newspapers.
"Use information and clues from the child's memories. Flyers, posters, and word of mouth spread messages through the local community and police networks where communication systems have broken down from the disaster," said Chasky.
Mapping
When children are found wandering the streets alone, parents and caretakers can be traced by re-walking the area and mapping out potential locations.
"Tracing starts immediately in the area where a child is found then spreads to the surrounding areas," according to Anette Lyth, senior emergency specialist in child protection at the UN Children's Fund (UNICEF).
Children under five who are too young to provide information on their addresses can have their photos posted on community boards with messages to locate caregivers.
New technology
Text messages are a rapid means to disseminate information and restore contact between family members. Satellite phones can be used in areas left without telephones, such as early this year in southeastern Brasil where flooding and mudslides left families devastated and without any means of communication with relatives in other parts of the country.
"Advances in technology have had a major impact on tracing, mainly by speeding up the transmission of information to huge numbers of people," according to the International Committee of the Red Cross (ICRC) Central Tracing Agency.
The ICRC started tracing in the late 1800s to alert families to the whereabouts and well-being of detained relatives. It currently relays hundreds of thousands of messages linking families back together and providing the peace of mind and closure so often absent in times of crises.
In 2009 alone, more than 253,000 messages were collected and delivered. Tracing assisted the repatriation of Congolese PoWs, and enabled nearly 200 video calls between detainees and their families in Afghanistan.
ICRC's Family Links website
Within two weeks of the earthquake that struck Haiti in January 2010, more than 26,000 missing people were located using the ICRC's Family Links website where people can search for missing people, and submit knowledge on the whereabouts of survivors.
Since 2009, more than 83,000 names of people wishing to contact relatives, or people with clues about missing relatives, have been entered into the data system.
"It enables people to communicate with one another and strives to reunite separated family members, to locate missing relatives and to recover and identify human remains," according to the ICRC 2009 Annual Report.
The website is currently up and running to find missing people from the tsunami that hit Japan following the 11 March earthquake.
While tracing has been part and parcel of ICRC activities for over 100 years, other agencies currently undertaking tracing activities include Save the Children, UNICEF, Plan International and Refugees United.
"Preventing family separation is the best form of social protection," said Chasky of Save the Children.
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